<div style="display: flex; flex-direction: column; height: 100%;">
  <div style="flex-grow: 1;">
    <p-tree #tree gnTree url="assets/data.tree.json?parent=" selectionMode="multiple" rootLabel="根节点"></p-tree>
  </div>
  <div>
    <!--{{tree.selection|json}}-->
  </div>
</div>
